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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1145 (Abs Guided Routine Testing) >> Pinpoint Tests >> Pinpoint Test MA: Front Wheel Speed Sensor Electrical Faults >> Visual Inspection and Diagnostic Pre-checks

Visual Inspection and Diagnostic Pre-checks

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
Fig 1: Antilock Braking System (ABS) Module Connector End View (C135)
G12751624Courtesy of FORD MOTOR CO.
Harness Side

Circuit Pin
LF WSS LO (Left Front Wheel Speed Sensor Low) - RCA17 7 (YELLOW)
LF WSS HI (Left Front Wheel Speed Sensor High) - VCA03 24 (VIOLET/WHITE)
RF WSS LO (Right Front Wheel Speed Sensor Low) - RCA19 26 (VIOLET)
RF WSS HI (Right Front Wheel Speed Sensor HI) - VCA05 21 (GRAY/VIOLET)
Fig 2: Left Front Wheel Speed Sensor Connector End View (C150)
G12751625Courtesy of FORD MOTOR CO.
Harness Side

Circuit Pin
LF WSS LO (Left Front Wheel Speed Sensor Low) - RCA17 2 (YELLOW)
LF WSS HI (Left Front Wheel Speed Sensor High) - VCA03 1 (VIOLET/WHITE)
Fig 3: Right Front Wheel Speed Sensor Connector End View (C160)
G12751626Courtesy of FORD MOTOR CO.
Harness Side

Circuit Pin
RF WSS LO (Right Front Wheel Speed Sensor Low) - RCA19 2 (VIOLET)
RF WSS HI (Right Front Wheel Speed Sensor HI) - VCA05 1 (GRAY/VIOLET)
  1. MA1: CHECK FOR FAULT REPEATABILITY 
    • Ignition ON, engine OFF.
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Test drive the vehicle above 20 km/h (12 mph).
    • Bring the vehicle to a safe stop.
    • Carry out the ABS self-test.
    • Is one or more of the DTCs shown in the ABS DTC Fault Trigger Conditions table present? 
    Yes No
    Go to  MA2. The system is operating correctly at this time.
    INSPECT both front wheel speed sensor electrical connectors and the ABS module electrical connector.
    REPAIR or CLEAN the connector as necessary.
    ADDRESS the root cause of any connector or pin issues.
  2. MA2: CHECK THE VEHICLE FOR THE ACTIVE PARK ASSIST FEATURE 
    • Check the vehicle for the active park assist feature.
    • Is the vehicle equipped with the active park assist feature? 
    Yes No
    If DTC C0031:15 or C0034:15 is present, Go to  MA7.
    If DTC C0031:11 or C0034:11 is present, Go to  MA9.    		 Go to  MA3.
  3. MA3: CHECK IF A ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER IS AVAILABLE 
    • Check if the Rotunda Active Wheel Speed Sensor Tester is available.
    • Is the Rotunda Active Wheel Speed Sensor Tester available? 
    Yes No
    Go to  MA4. If DTC C0031:15 or C0034:15 is present, Go to  MA7.
    If DTC C0031:11 or C0034:11 is present, Go to  MA9.
  4. MA4: CHECK THE ABS MODULE OUTPUT USING THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Ignition OFF.
    • Disconnect the suspect wheel speed sensor connector.
    • Connect the Rotunda Active Wheel Speed Sensor Tester to the suspect wheel speed sensor connector.
    • Ignition ON, engine OFF.
    • Select the correct system polarity on the Rotunda Active Wheel Speed Sensor Tester and turn the power switch to the ON position.
    • Is the tester output LED illuminated? 
    Yes No
    Go to  MA5. Go to  MA7.
  5. MA5: CHECK THE WHEEL SPEED SENSOR FOR A SHORT TO VOLTAGE WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Observe the current overload LED on the Rotunda Active Wheel Speed Sensor Tester.
    • Is the current overload LED illuminated? 
    Yes No
    REPAIR the suspect wheel speed sensor circuit for a short to voltage. Go to  MA6.
  6. MA6: CHECK THE WHEEL SPEED SENSOR OUTPUT WITH THE ROTUNDA ACTIVE WHEEL SPEED SENSOR TESTER 
    • Raise the vehicle until the suspect wheel can spin freely. Refer to JACKING AND LIFTING .
    • While monitoring the Rotunda Active Wheel Speed Sensor Tester, slowly spin the suspect wheel.
    • Do the sensor output Light-emitting Diodes (LEDs) illuminate and flash? 
    Yes No
    The system is operating correctly at this time.
    INSPECT all wheel speed sensor electrical connectors and the ABS module electrical connectors. REPAIR or CLEAN the connector as necessary. ADDRESS the root cause of any connector or pin issues.    		 INSTALL a new wheel speed sensor for the one in question. REFER to Anti-Lock Brake System (ABS) and Stability Control .
  7. MA7: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO BATTERY VOLTAGE 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Disconnect the suspect wheel speed sensor.
    • Ignition ON, engine OFF.
    • For the left front wheel speed sensor:
    • Measure the voltage between:
      (+) Left Front Wheel Speed Sensor (C150) Connector, Harness Side (-)
      LF WSS LO - RCA17 (YELLOW) - Pin 2 Ground
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 1 Ground
    • For the right front wheel speed sensor:
    • Measure the voltage between:
      (+) Right Front Wheel Speed Sensor (C160) Connector, Harness Side (-)
      RF WSS LO - RCA19 (VIOLET) - Pin 2 Ground
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 1 Ground
    • Is any voltage present? 
    Yes No
    REPAIR the circuit in question. Go to  MA8.
  8. MA8: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • For the left front wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) Left Front Wheel Speed Sensor (C150) Connector, Harness Side
      LF WSS LO - RCA17 (YELLOW) - Pin 7 LF WSS LO - RCA17 - Pin 2
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 24 LF WSS HI - VCA03 - Pin 1
    • For the right front wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) Right Front Wheel Speed Sensor (C160) Connector, Harness Side
      RF WSS LO - RCA19 (VIOLET) - Pin 26 RF WSS LO - RCA19 - Pin 2
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 21 RF WSS HI - VCA05 - Pin 1
    • Are the resistances less than 3 ohms? 
    Yes No
    Go to  MA9. REPAIR the circuit in question.
  9. MA9: CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS 
    • Ignition OFF.
    • Disconnect the ABS module connector (if not previously disconnected).
    • Disconnect the suspect wheel speed sensor connector (if not previously disconnected).
    • For the left front wheel speed sensor:
    • Measure the resistance between:
      (+) Left Front Wheel Speed Sensor (C150) Connector, Harness Side (-) Left Front Wheel Speed Sensor (C150) Connector, Harness Side
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 1 LF WSS LO - RCA17 - Pin 2
    • For the right front wheel speed sensor:
    • Measure the resistance between:
      (+) Right Front Wheel Speed Sensor (C160) Connector, Harness Side (-) Right Front Wheel Speed Sensor (C160) Connector, Harness Side
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 1 RF WSS LO - RCA19 - Pin 2
    • Is the resistance greater 10, 000 ohms? 
    Yes No
    Go to  MA10. REPAIR the circuits.
  10. MA10: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • For the left front wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      LF WSS LO - RCA17 (YELLOW) - Pin 7 Ground
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 24 Ground
    • For the right front wheel speed sensor:
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      RF WSS LO - RCA19 (VIOLET) - Pin 26 Ground
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 21 Ground
    • Are the resistances greater than 10, 000 ohms? 
    Yes No
    Go to  MA11. REPAIR the circuit in question.
  11. MA11: CHECK THE ABS MODULE OUTPUT 
    NOTE: Make sure all test connections are made at the wheel speed sensor before the ignition is set to ON.
    NOTE: Use a meter with a min/max feature and/or recording capabilities to obtain accurate measurements. The ABS module disables the voltage output immediately if the wheel speed sensor is not present.
    • ABS Module connector connected. (C135)
    • Connect the meter to the suspect wheel speed sensor electrical connector, harness side.
    • Set the meter to measure DC voltage.
    • Set the meter range to greater than 15 volts.
    • Enable the min/max or recording feature on the meter.
    • Ignition ON, engine OFF.
    • For the left front wheel speed sensor:
    • Measure the voltage between:
      (+) Left Front Wheel Speed Sensor (C150) Connector, Harness Side (-) Left Front Wheel Speed Sensor (C150) Connector, Harness Side
      LF WSS HI - VCA03 (VIOLET/WHITE) - Pin 1 LF WSS LO - RCA17 - Pin 2
    • For the right front wheel speed sensor:
    • Measure the voltage between:
      (+) Right Front Wheel Speed Sensor (C160) Connector, Harness Side (-) Right Front Wheel Speed Sensor (C160) Connector, Harness Side
      RF WSS HI - VCA05 (GRAY/VIOLET) - Pin 1 RF WSS LO - RCA19 - Pin 2
    • Check the maximum recorded voltage on the meter.
    • Is the voltage greater 10 volts? 
    Yes No
    INSTALL a new wheel speed sensor for the one in question. REFER to Anti-Lock Brake System (ABS) and Stability Control . Go to  MA13.
  12. MA12: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 
    Yes No
    Go to  MA13. REPAIR the connector or terminals. Refer to OEM CONNECTOR REPAIR PROCEDURES , for schematic and connector information.
  13. MA13: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Connect the suspect wheel speed sensor electrical connector. Make sure it seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new ABS module.
    CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
    If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
    If no service articles address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module .
    ORDER a replacement ABS module and INCLUDE the RVC on the form.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
    When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
    When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.
  14. MA14: CHECK FOR CORRECT ABS OPERATION 
    • Connect the suspect wheel speed sensor electrical connector. Make sure the connector seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new ABS module.
    CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
    If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
    If no service articles address this concern, INSTALL a new ABS module and HCU assembly. REFER to Anti-Lock Brake System (ABS) and Stability Control .
    ORDER a replacement ABS module and HCU assembly. INCLUDE the RVC on the form.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
    When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
    When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.
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